Thread: Extract interdependent info from one table
Hi Guys, I can't quite wrap my head around this one ... I have \d docmaster Table "public.docmaster" Column | Type | Modifiers ----------------+------------------------+-----------alias1 | integer |alias2 | charactervarying(25) |subclass_alias | character varying(25) |docnum | integer | not nullversion | integer |docname | character varying(255) | Indexes: "docmaster_docnum_key" UNIQUE, btree (docnum) with the following data: # select * from docmaster ;alias1 | alias2 | subclass_alias | docnum | version | docname --------+-----------+----------------+--------+---------+----------------- 3589 | Completed | Inquiry | 653218 | 1 | My greater doc2 3587 | Pending | Post | 653216 | 3 | My great doc1 3588 | Draft | Reply | 653217 | 1 | My great doc2 3587 | Draft | Reply | 653219 | 2 | My greater doc4 (4 rows) Now I want to find inquiries (subclass_alias = 'Inquiry'), list their status and also (if there's another row that a) has the same alias1, a subclass of Reply and a status (alias2) of pending or redraft.... how do I achieve this? What I have is select docnum, alias1, alias2, subclass_alias from docmaster where (alias1 = ( select alias1 from docmaster where subclass_alias = 'Post' and ( alias2 = 'Pending' or alias2 = 'Redraft' ))) and ( alias2 = 'Pending' or alias2 = 'Draft' ) and subclass_alias <> 'Post' ;docnum | alias1 | alias2 | subclass_alias --------+--------+---------+----------------653219 | 3587 | Redraft | Reply (1 row) What I'd really like is to BOTH Post AND reply, with the alias2 for both. Hope this was as clear as mud? :) Cheers, Andrej -- Please don't top post, and don't use HTML e-Mail :} Make your quotes concise. http://www.american.edu/econ/notes/htmlmail.htm
> docnum | alias1 | alias2 | subclass_alias
> --------+--------+---------+----------------
> 653219 | 3587 | Redraft | Reply
> (1 row)
>
> What I'd really like is to BOTH Post AND reply, with the alias2 for both.
> Hope this was as clear as mud? :)
Absolutely clear as mud :P
I think this might be what you're after
SELECT docnum, alias1, alias2, subclass_alias
FROM docmaster
WHERE subclass_alias = 'Inquiry' AND alias1 IN ( SELECT alias1
FROM docmaster WHERE subclass_alias = 'Reply'
AND ( alias2 = 'Pending'
ORalias2 = 'Redraft' ) )
THINK BEFORE YOU PRINT - Save paper if you don't really need to print this
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On 25/01/2008, Phillip Smith <phillip.smith@weatherbeeta.com.au> wrote:
> Absolutely clear as mud :P
sorry ... I'm not too good with expressing my SQL needs, I'm afraid,
Thanks for trying :}
In the end I got it sorted with the following
select dm.docnum, dm.alias1, dm.docname, dm.alias2 as "Status", dm2.alias2 as "Reply"
from docmaster as dm
left outer join ( select alias1, subclass_alias, alias2, entrywhen from docmaster where
subclass_aliasin ('Reply','MinTR') and alias2 in ('PENDING','COMPLETED') ) as dm2
on dm2.alias1 = dm.alias1
where dm.subclass_alias='Post' and alias2 in ('PENDING','REDRAFT');
Cheers,
Andrej
--
Please don't top post, and don't use HTML e-Mail :} Make your quotes concise.
http://www.american.edu/econ/notes/htmlmail.htm